It has come to our attention that the PostGIS Raster support
may give more privileges to users than an administrator is
willing to grant. These include reading files from the filesystem
and opening connections to network hosts.

The PostGIS development team is proud to release PostGIS 2.1.0.
As befits a minor release, the focus is on speed improvements, more features, and bug fixes.

If you are currently using PostGIS 2.0+, you can go the soft upgrade path:

ALTER EXTENSION postgis UPDATETO"2.1.0";

If you are running 2.1.0 of beta or an unreleased version
(and the above step fails with error “extension postgis has no update path from version x.x.x to version 2.1.0”)
, you need to first copy the file
in share\extensions\postgis—2.0.3—2.1.0.sql and change the 2.0.3 to the x.x.x noted in the error you are running.
Then follow the above upgrade step again.

Users of 1.5 and below will need to go the hard-upgrade path
documented in manual: